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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
#include "qpid/broker/ThresholdAlerts.h"
#include "qpid/broker/Queue.h"
#include "qpid/broker/QueuedMessage.h"
#include "qpid/amqp_0_10/Codecs.h"
#include "qpid/log/Statement.h"
#include "qpid/management/ManagementAgent.h"
#include "qmf/org/apache/qpid/broker/EventQueueThresholdExceeded.h"
namespace qpid {
namespace broker {
namespace {
const qmf::org::apache::qpid::broker::EventQueueThresholdExceeded EVENT("dummy", 0, 0);
bool isQMFv2(const boost::intrusive_ptr<Message> message)
{
const qpid::framing::MessageProperties* props = message->getProperties<qpid::framing::MessageProperties>();
return props && props->getAppId() == "qmf2";
}
bool isThresholdEvent(const boost::intrusive_ptr<Message> message)
{
if (message->getIsManagementMessage()) {
//is this a qmf event? if so is it a threshold event?
if (isQMFv2(message)) {
const qpid::framing::FieldTable* headers = message->getApplicationHeaders();
if (headers && headers->getAsString("qmf.content") == "_event") {
//decode as list
std::string content = message->getFrames().getContent();
qpid::types::Variant::List list;
qpid::amqp_0_10::ListCodec::decode(content, list);
if (list.empty() || list.front().getType() != qpid::types::VAR_MAP) return false;
qpid::types::Variant::Map map = list.front().asMap();
try {
std::string eventName = map["_schema_id"].asMap()["_class_name"].asString();
return eventName == EVENT.getEventName();
} catch (const std::exception& e) {
QPID_LOG(error, "Error checking for recursive threshold alert: " << e.what());
}
}
} else {
std::string content = message->getFrames().getContent();
qpid::framing::Buffer buffer(const_cast<char*>(content.data()), content.size());
if (buffer.getOctet() == 'A' && buffer.getOctet() == 'M' && buffer.getOctet() == '2' && buffer.getOctet() == 'e') {
buffer.getLong();//sequence
std::string packageName;
buffer.getShortString(packageName);
if (packageName != EVENT.getPackageName()) return false;
std::string eventName;
buffer.getShortString(eventName);
return eventName == EVENT.getEventName();
}
}
}
return false;
}
}
ThresholdAlerts::ThresholdAlerts(const std::string& n,
qpid::management::ManagementAgent& a,
const uint32_t ct,
const uint64_t st,
const long repeat)
: name(n), agent(a), countThreshold(ct), sizeThreshold(st),
repeatInterval(repeat ? repeat*qpid::sys::TIME_SEC : 0),
count(0), size(0), lastAlert(qpid::sys::EPOCH) {}
void ThresholdAlerts::enqueued(const QueuedMessage& m)
{
size += m.payload->contentSize();
++count;
if ((countThreshold && count >= countThreshold) || (sizeThreshold && size >= sizeThreshold)) {
if ((repeatInterval == 0 && lastAlert == qpid::sys::EPOCH)
|| qpid::sys::Duration(lastAlert, qpid::sys::now()) > repeatInterval) {
//Note: Raising an event may result in messages being
//enqueued on queues; it may even be that this event
//causes a message to be enqueued on the queue we are
//tracking, and so we need to avoid recursing
if (isThresholdEvent(m.payload)) return;
lastAlert = qpid::sys::now();
agent.raiseEvent(qmf::org::apache::qpid::broker::EventQueueThresholdExceeded(name, count, size));
QPID_LOG(info, "Threshold event triggered for " << name << ", count=" << count << ", size=" << size);
}
}
}
void ThresholdAlerts::dequeued(const QueuedMessage& m)
{
size -= m.payload->contentSize();
--count;
if ((countThreshold && count < countThreshold) || (sizeThreshold && size < sizeThreshold)) {
lastAlert = qpid::sys::EPOCH;
}
}
void ThresholdAlerts::observe(Queue& queue, qpid::management::ManagementAgent& agent,
const uint64_t countThreshold,
const uint64_t sizeThreshold,
const long repeatInterval)
{
if (countThreshold || sizeThreshold) {
boost::shared_ptr<QueueObserver> observer(
new ThresholdAlerts(queue.getName(), agent, countThreshold, sizeThreshold, repeatInterval)
);
queue.addObserver(observer);
}
}
void ThresholdAlerts::observe(Queue& queue, qpid::management::ManagementAgent& agent,
const qpid::framing::FieldTable& settings, uint16_t limitRatio)
{
qpid::types::Variant::Map map;
qpid::amqp_0_10::translate(settings, map);
observe(queue, agent, map, limitRatio);
}
template <class T>
class Option
{
public:
Option(const std::string& name, T d) : defaultValue(d) { names.push_back(name); }
void addAlias(const std::string& name) { names.push_back(name); }
T get(const qpid::types::Variant::Map& settings) const
{
T value(defaultValue);
for (std::vector<std::string>::const_iterator i = names.begin(); i != names.end(); ++i) {
if (get(settings, *i, value)) break;
}
return value;
}
private:
std::vector<std::string> names;
T defaultValue;
bool get(const qpid::types::Variant::Map& settings, const std::string& name, T& value) const
{
qpid::types::Variant::Map::const_iterator i = settings.find(name);
if (i != settings.end()) {
try {
value = (T) i->second;
} catch (const qpid::types::InvalidConversion&) {
QPID_LOG(warning, "Bad value for" << name << ": " << i->second);
}
return true;
} else {
return false;
}
}
};
void ThresholdAlerts::observe(Queue& queue, qpid::management::ManagementAgent& agent,
const qpid::types::Variant::Map& settings, uint16_t limitRatio)
{
//Note: aliases are keys defined by java broker
Option<int64_t> repeatInterval("qpid.alert_repeat_gap", 60);
repeatInterval.addAlias("x-qpid-minimum-alert-repeat-gap");
//If no explicit threshold settings were given use specified
//percentage of any limit from the policy.
const QueuePolicy* policy = queue.getPolicy();
Option<uint32_t> countThreshold("qpid.alert_count", (uint32_t) (policy && limitRatio ? (policy->getMaxCount()*limitRatio/100) : 0));
countThreshold.addAlias("x-qpid-maximum-message-count");
Option<uint64_t> sizeThreshold("qpid.alert_size", (uint64_t) (policy && limitRatio ? (policy->getMaxSize()*limitRatio/100) : 0));
sizeThreshold.addAlias("x-qpid-maximum-message-size");
observe(queue, agent, countThreshold.get(settings), sizeThreshold.get(settings), repeatInterval.get(settings));
}
}}
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